P0BC2 code meaning
Hybrid/EV Battery Temperature Sensor E Circuit
Powertrain system Generic code P0Bxx codes Check engine light
What P0BC2 means
Battery temperature sensor E is the fifth thermistor in the high-voltage pack; GM's Chevrolet Volt bulletin 18-NA-342 lists the E codes as temperature sensor 5 of nine. P0BC2 is the general circuit code, used when the controller detects an electrical fault without classing it as low, high or erratic. GM's hybrid tables report only the specific siblings P0BC3 to P0BC6. NHTSA's summary of an Audi pending service solution for 2027 Q6 and A6 e-tron models names P0BC2 with a failure type byte among implausible temperature sensor errors. CARB requires battery temperature sensors to be monitored for circuit faults. With one value missing the controller limits charge and discharge power. The sensor sits inside the pack, so checks call for high-voltage safety procedures.
P0BC2 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P0BC2
- Hybrid or EV system warning and MIL
- Reduced power or charging rate
- Battery cooling running more than usual
Common causes of P0BC2
- Most likelyLoose or corroded connector of sensor E at the sensing board
- PossibleFailed thermistor E
- Less likelyFaulty input on the battery sensing board or module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery temp sensor eWiring harnessBms
What each part of P0BC2 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B | Area: hybrid propulsion. |
| C2 | The exact fault in that area. |
What to do next
- Note P0BC2 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0BC2
What does P0BC2 mean?
P0BC2 means "Hybrid/EV Battery Temperature Sensor E Circuit". Battery temperature sensor E is the fifth thermistor in the high-voltage pack; GM's Chevrolet Volt bulletin 18-NA-342 lists the E codes as temperature sensor 5 of nine. It is a generic code, so it means the same on every make.
Is it safe to drive with P0BC2?
Drive gently and only to a workshop. With P0BC2 the car can go into limp mode (reduced power) to protect itself.
Will P0BC2 fail an emissions test?
Yes, it can. P0BC2 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0BC2 to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P0BC2 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.